So
you have your .sql file uploaded onto your hosting in the root of that users directory…
You ssh in with putty
You run this command:
mysql --user=youruser --password=yourpassword --host=yourdatabasedomain.com yourdatabase < yourfiletoimport.sql

So
you have your .sql file uploaded onto your hosting in the root of that users directory…
You ssh in with putty
You run this command:
mysql --user=youruser --password=yourpassword --host=yourdatabasedomain.com yourdatabase < yourfiletoimport.sql